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Vishay General Semiconductor - Diodes Division SMB8J12CAHM3/H
- Part No.:
- SMB8J12CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J12CAHM3/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,475
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Product details
Overview
SMB8J12CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 19.9 V clamping voltage (VC) at 40.2 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J12CAHM3/H datasheet, SMB8J12CAHM3/H pinout, SMB8J12CAHM3/H application, or SMB8J12CAHM3/H equivalent, key selection criteria include AEC-Q101 qualification, bidirectional clamping behavior, low clamping ratio (VC/VWM ≈ 1.66), halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 12 V), but triggers into low-impedance conduction when transient voltage exceeds VBR, diverting surge current away from downstream ICs. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
Rated for -55 °C to +150 °C operating junction temperature and qualified to AEC-Q101, SMB8J12CAHM3/H supports automotive-grade reliability requirements including MSL Level 1 (260 °C reflow peak) and JESD201 Class 2 whisker resistance. Thermal resistance is 72 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - precise breakdown onset range ensuring consistent turn-on across production lots |
| VC @ IPPM | 19.9 V at 40.2 A - clamping voltage during 10/1000 µs surge; limits protected circuit stress to ≤1.66× VWM |
| PPPM | 800 W - peak pulse power handling capability with standard 10/1000 µs waveform; enables robust ESD and lightning surge immunity |
| ID @ VWM | 5.0 µA - ultra-low reverse leakage at rated stand-off voltage, minimizing standby power loss in battery-powered systems |
| TJ max. | +150 °C - extended junction temperature rating supporting under-hood automotive and high-ambient industrial use |
| AEC-Q101 | Qualified - validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD HBM/MM |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads solderable per J-STD-002 and JESD22-B102. No polarity marking - bidirectional operation eliminates cathode/anode distinction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Surge current path terminal | Both terminals function identically; bidirectional conduction allows single-device protection of AC or differential lines without orientation constraints |
| Case (cathode band absent) | Thermal and mechanical interface | No marking required; symmetric construction simplifies PCB layout and automated placement; thermal path optimized via 5.0 mm × 5.0 mm copper pads per lead |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled, differential, or floating signal lines without polarity sensitivity |
| AEC-Q101 qualification | Validated reliability for automotive ECUs, ADAS sensors, and body control modules requiring zero-defect field performance |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and supports lead-free reflow assembly with 260 °C peak profile (MSL Level 1) |
| Low clamping ratio (VC/VWM = 1.66) | Minimizes overvoltage stress on protected ICs - critical for 3.3 V/5 V logic and automotive CAN/LIN transceivers |
| Fast response time (<1 ps) | Clamps transients before propagation into sensitive circuitry; effective against ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4) |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role: Bidirectional shunt clamp placed between signal line and ground, absorbing ±100 V/500 ms transients. Use Value: Prevents latch-up or damage to microcontroller ADC inputs and LIN transceivers while maintaining <5 µA leakage at 12 V system rail. |
Use Scenario: Safeguarding 4–20 mA current loop inputs in programmable logic controllers subjected to induced surges from nearby motor switching. IC Role / Device Role: High-power TVS placed across input terminals to clamp common-mode transients up to 800 W without degrading loop accuracy. Use Value: Enables uninterrupted operation under IEC 61000-4-5 Level 3 (2 kV surge) while preserving signal integrity via low capacitance and leakage. |
| USB Type-C Port Protection | Telecom Line Interface |
Use Scenario: Secondary-level surge suppression on USB-C CC and VCONN lines where space-constrained layout prohibits multi-stage designs. IC Role / Device Role: Standalone bidirectional clamp limiting voltage excursions to ≤20 V during hot-plug ESD events and cable-induced transients. Use Value: Eliminates need for discrete RC filters or additional TVS arrays; SMB footprint fits tight board areas near connectors. |
Use Scenario: Protecting Ethernet PHY or DSL line drivers from lightning-induced surges on outdoor telecom equipment interfaces. IC Role / Device Role: Primary shunt protector on twisted-pair lines, coordinated with gas discharge tubes for staged energy handling. Use Value: Withstands repeated 800 W surges while maintaining <1 pF junction capacitance - avoids signal distortion in 10/100BASE-TX applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J12CAHE3/H | Same electrical specs, RoHS-compliant but not halogen-free; uses standard SnPb-compatible plating instead of HM3 matte tin | Preferred for commercial/industrial designs where halogen-free requirement is not mandated | Select SMB8J12CAHE3/H if AEC-Q101 is unnecessary and cost optimization is prioritized over halogen-free compliance |
| SMAJ12CA | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (95 °C/W), same VWM/VC specs | Suitable for lower-energy surges or space-constrained consumer electronics; not AEC-Q101 qualified | Choose SMAJ12CA only for non-automotive applications with ≤400 W surge exposure and tighter board area budgets |
Compared with SMB8J12CAHE3/H, SMB8J12CAHM3/H adds halogen-free compliance and identical AEC-Q101 qualification; versus SMAJ12CA, it delivers double the surge power rating and automotive-grade reliability - making SMB8J12CAHM3/H the sole choice for demanding automotive and industrial 800 W transient environments.
Availability
SMB8J12CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMB8J12CAHM3/H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power density, and automotive qualification.
The SMB8JxxCA series targets high-reliability transient suppression in automotive and industrial systems, engineered for AEC-Q101 compliance, low clamping voltage, and robust surge handling in compact SMB packages.
FAQ
What is the clamping voltage of SMB8J12CAHM3/H at its rated peak pulse current?
The SMB8J12CAHM3/H has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current (IPPM) of 40.2 A using the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures protected circuits experience no more than 19.9 V during surge events - critical for safeguarding 12 V nominal systems and 3.3 V/5 V logic interfaces. The SMB8J12CAHM3/H maintains this performance across its full operating temperature range.
Is SMB8J12CAHM3/H suitable for automotive applications?
Yes, SMB8J12CAHM3/H is AEC-Q101 qualified and specifically designed for automotive use, including engine control units, ADAS sensors, and body electronics. Its qualification covers high-temperature operation (TJ up to +150 °C), thermal cycling, humidity testing, and ESD robustness. The HM3 suffix confirms halogen-free, RoHS-compliant construction meeting automotive material requirements - making SMB8J12CAHM3/H appropriate for under-hood and cabin applications where reliability is mission-critical.
How does the bidirectional configuration of SMB8J12CAHM3/H affect circuit design?
The bidirectional configuration of SMB8J12CAHM3/H eliminates polarity concerns during PCB layout and assembly - both terminals are functionally identical, enabling protection of AC signals, differential pairs (e.g., RS-485, CAN), or floating lines without orientation checks. This simplifies design, reduces BOM complexity, and avoids field failures due to incorrect placement. Unlike unidirectional TVS diodes, SMB8J12CAHM3/H clamps surges of either polarity symmetrically, delivering consistent 19.9 V clamping regardless of transient direction.
What is the thermal resistance of SMB8J12CAHM3/H, and how does it impact PCB layout?
SMB8J12CAHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W. To achieve rated 800 W surge capability, the datasheet specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad size or omitting thermal vias increases junction temperature during surge events, derating power capability - so PCB layout must strictly follow Vishay's recommended pad dimensions and copper weight to ensure SMB8J12CAHM3/H performs to specification.
Does SMB8J12CAHM3/H require external components for basic surge protection?
No, SMB8J12CAHM3/H functions as a standalone shunt TVS device and requires no external resistors, capacitors, or inductors for fundamental transient suppression. It connects directly between the protected line and ground (or between differential lines). However, for high-frequency ESD or multi-stage protection (e.g., coordinating with GDTs for lightning), designers may add series impedance or filtering - but SMB8J12CAHM3/H itself delivers full 800 W clamping performance in isolation, verified per IEC 61000-4-5 and ISO 16750-2 test standards.
SMB8J12CAHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 40.2A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J12CAHM3/H FAQ
1.How can I place an order for SMB8J12CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J12CAHM3/H on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMB8J12CAHM3/H reliable?
The price and inventory of SMB8J12CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J12CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMB8J12CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J12CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J12CAHM3/H?
SMB8J12CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J12CAHM3/H order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMB8J12CAHM3/H?
For technical support, including SMB8J12CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J12CAHM3/H requirements.
6.How does Aetrix verify that SMB8J12CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMB8J12CAHM3/H products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMB8J12CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMB8J12CAHM3/H?
All SMB8J12CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J12CAHM3/H, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMB8J12CAHM3/H part is unused and in its original packaging.
Return procedure for SMB8J12CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J12CAHM3/H Tags
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